计算1/1-1/2+1/3-1/4+1/5 …… + 1/99

#include <stdio.h>#include <math.h>int main(){double i = 0;double sum = 0;for(i = 1; i <= 100; i++){sum = sum + 1/i * pow(-1,i-1);}    printf("%lf\n",sum);return 0;}